采用激光沉积修复技术对GH4169镍基高温合金贯通槽式损伤工件进行修复，分析了修复过程中气孔及熔合不良等缺陷的产生原因，通过优化工艺参数，获得了无缺陷的修复件；考察了修复件的微观组织及力学性能，并对修复件进行了局部热处理。结果表明：优化工艺参数后得到的修复区和基体形成了致密的冶金结合，采用局部热处理可明显提升修复件的抗拉强度。

Researches on the laser deposition repair of GH4169 nickel-based superalloy with defects of through-groove damage were conducted. The reasons of occurring defects such as gas porosities and ill bonding in the repaired zone were analyzed. And flawless samples were obtained through optimizing laser process parameters. The microstructure characteristic and mechanical properties of laser deposition repair component were investigated, and the local heat treatment of the laser deposition repair component was done. The results indicate that there is a dense metallurgical bond between the repaired zone and the substrate with the optimized process parameters. The tensile strength of laser deposition repair component can be significantly improved with the local heat treatment.